According to a Sunday New York Times article, the show’s writers added this assertion because actor Daniel Sunjata is a “truther”; but the real firefighters on set—who work as script advisers—were offended by his allegations.

This got the Explainer wondering: Do any firefighters believe in 9/11 conspiracy theories?

Yes. There’s no evidence that firefighters buy into 9/11 conspiracy theories at higher rates than the rest of the population. (A 2007 Zogby poll found that 26 percent of Americans believe the government “let it happen.”

A 2006 Scripps-Howard poll found it was more than a third.) But some firemen do believe the government was behind 9/11 and use their status as first responders to draw attention to their statements.

The most common conspiracy theory held by firefighters is that the Twin ToRead Full Story